A BDSM group with roots connected to Christianity. A sub-culture in the Midwest Kaysianity is extremely popular among strange groups of people including pedophiles and emo teenage girls. Membership is fairly complex. It involves the use of a sacrificial butt plug that has been wet with goats blood, holy oil and the semen or vaginal fluids of all current members. The only clause in joining is "members must be willing to partake in genital mutilation."
The root word Kaysi is from the name of the Original leader, who is known for her aggressiveness towards "baby ducks".

Bob: So what churchdo yougo to?
Hank: I follow Kaysianity.
Bob: Is that the one with the butt plugs?
Hank: Yep.